tree 93b1b9d4eaf6823d1db74438fdc41306ab7838dc
parent c5e3c9ee46a49874a45a727181af708802fa0d60
author Alexandru Elisei <alexandru.elisei@arm.com> 1586875186 +0100
committer Will Deacon <will@kernel.org> 1586964479 +0100

ioport: Fail when registering overlapping ports

If we try to register a range of ports which overlaps with another, already
registered, I/O ports region then device emulation for that region will not
work anymore. There's nothing sane that the ioport emulation layer can do
in this case so refuse to allocate the port. This matches the behavior of
kvm__register_mmio.

There's no need to protect allocating a new ioport struct with a lock, so
move the lock to protect the actual ioport insertion in the tree.

Reviewed-by: Andre Przywara <andre.przywara@arm.com>
Signed-off-by: Alexandru Elisei <alexandru.elisei@arm.com>
Signed-off-by: Will Deacon <will@kernel.org>